package com.biancheng.biancheng.biancheng6;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;


public class 克拉兹猜想 {
//*
//* 12、 克拉兹猜想：任取一正整数，如果是偶数，将其除以2。如果是奇数，将其乘以3再加1，然后重复这个过程，最后结果都会陷入4 2 1 的循环。
//* 比如序列：13, 40, 20, 10, 5, 16, 8, 4, 2, 1, 4, 2, 1
//* 请通过编程实现，当4,2,1重复第二次的时候，结束循环。请输出以下3个序列：
//* [13, 40, 20, 10, 5, 16, 8, 4, 2, 1, 4, 2, 1]
//* [31, 94, 47, 142, 71, 214, 107, 322, 161, 484, 242, 121, 364, 182, 91, 274, 137, 412, 206, 103, 310, 155, 466, 233, 700, 350, 175, 526, 263, 790, 395, 1186, 593, 1780, 890, 445, 1336, 668, 334, 167, 502, 251, 754, 377, 1132, 566, 283, 850, 425, 1276, 638, 319, 958, 479, 1438, 719, 2158, 1079, 3238, 1619, 4858, 2429, 7288, 3644, 1822, 911, 2734, 1367, 4102, 2051, 6154, 3077, 9232, 4616, 2308, 1154, 577, 1732, 866, 433, 1300, 650, 325, 976, 488, 244, 122, 61, 184, 92, 46, 23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1, 4, 2, 1]
//* [101, 304, 152, 76, 38, 19, 58, 29, 88, 44, 22, 11, 34, 17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1, 4, 2, 1]

    int i=0;
    public static void main(String[] args){
        克拉兹猜想 cc = new 克拉兹猜想();
        List list = new ArrayList();
        Long first = 13L;
        list.add(first);
        cc.collatz(first,list);
        System.out.println(Arrays.toString(list.toArray()));
        first = 31L;
        list = new ArrayList();
        list.add(first);
        cc.collatz(first,list);
        System.out.println(Arrays.toString(list.toArray()));
        list = new ArrayList();
        first = 101L;
        list.add(first);
        cc.collatz(first,list);
        System.out.println(Arrays.toString(list.toArray()));
    }
    private void collatz(long param,List list){
        if(param > 1){
            Long a = 0L;
            if (param%2 == 0) {
                a = param/2;
            } else {
                a = 3*param + 1;
            }
            list.add(a);
            collatz(a,list);
        }
    }


}
